test.erl

-module(test).
-behaviour(gen_server).

-export([start_link/0, init/1, handle_call/3, handle_cast/2, handle_info/2, terminate/2, code_change/3]).

%% API functions
start_link() ->
    gen_server:start(?MODULE, [], []).

init([]) ->
    {ok, []}.

handle_call(_Msg, _From, State) ->
    {reply, unknown_message, State}.

handle_cast(_Msg, State) ->
    {noreply, State}.

handle_info(_Info, State) ->
    {noreply, State}.

terminate(_Reason, _State) ->
    ok.
code_change(_OldVsn, State, _Extra) ->
    {ok, State}.